Executor's Sale. The Collection of over Five Hundred Paintings and Studies by the late John F. Kensett, will be sold at auction, in Association Hall, Y.M.C.A., 23d Street cor. Fourth Avenue, on the evenings of Monday, Tuesday, Wednesday, Thursday, Friday & Saturday, March 24th, 25th, 26th, 27th, 28th, 29th, at 7 1/2 o'clock, precisely. Robert Somerville, Auctioneer. These Paintings and Studies will remain on Exhibition, (day and evening,) free, at the Galleries of National Academy of Design, 23d Street, cor. 4th Avenue. R.M. Olyphant, Executor.